Function nextBackup

Engine/Project.cpp:532–543

if filePath matches .*\.~[0-9]+~, increment the backup number else append .~1~

// if filePath matches .*\.~[0-9]+~, increment the backup number
// else append .~1~
static QString
nextBackup(const QString & filePath)
{
    QRegExp rx(QString::fromUtf8("\\.~(\\d+)~$"));
    int pos = rx.lastIndexIn(filePath);
    if (pos >= 0) {
        int i = rx.cap(1).toInt();
        return filePath.left(pos) + QString::fromUtf8(".~%1~").arg(i+1);
    } else {
        return filePath + QString::fromUtf8(".~1~");
    }
}

QString
Project::saveProjectInternal(const QString & path,